Identifying the orbital angular momentum of light based on atomic ensembles
1 Department of Applied Physics, Xi'an Jiaotong University - Xi'an 710049, China
2 School of Science, Xi'an Shiyou University - Xi'an 710065, China
Received: 13 March 2012
Accepted: 9 July 2012
We propose a scheme to distinguish the orbital-angular-momentum state of the Laguerre-Gaussian (LG) beam based on the electromagnetically induced transparency modulated by a microwave field in atomic ensembles. We show that the transverse-phase variation of a probe beam with the LG mode can be mapped into the spatial intensity distribution due to the change of atomic coherence caused by the microwave. The proposal may provide a useful tool for studying higher-dimensional quantum information based on atomic ensembles.
PACS: 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 42.25.Kb – Coherence / 33.20.Bx – Radio-frequency and microwave spectra
© EPLA, 2012